23144353540513 has 4 divisors (see below), whose sum is σ = 23144396684868. Its totient is φ = 23144310396160.

The previous prime is 23144353540339. The next prime is 23144353540523. The reversal of 23144353540513 is 31504535344132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20910069999009 + 2234283541504 = 4572753^2 + 1494752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23144353540513 is a prime.

It is a super-2 number, since 2×23144353540513² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23144353540513.

It is not an unprimeable number, because it can be changed into a prime (23144353540523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20757256 + ... + 21843817.

It is an arithmetic number, because the mean of its divisors is an integer number (5786099171217).

Almost surely, 2^{23144353540513} is an apocalyptic number.

It is an amenable number.

23144353540513 is a deficient number, since it is larger than the sum of its proper divisors (43144355).

23144353540513 is an equidigital number, since it uses as much as digits as its factorization.

23144353540513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43144354.

The product of its (nonzero) digits is 1296000, while the sum is 43.

Adding to 23144353540513 its reverse (31504535344132), we get a palindrome (54648888884645).

The spelling of 23144353540513 in words is "twenty-three trillion, one hundred forty-four billion, three hundred fifty-three million, five hundred forty thousand, five hundred thirteen".